Gas furnace for photo-engravers, etc.



April 1, 1924;

led Sept. 1922 16-.1. l8

JAMEs CROKE Apr, 1,

JAE-E3318 030KB. OF ARLINGTON, MAESACHUSETTS.

GAS FURNACE FOB IEOTO-EIJG-RAVERS, ETC.

Application filed September To all whom it may concern:

Be it known that 1, James Crone, citizen of the United. States, residing at Arlington, in the county of Middlesc-X and State of Massachusetts, have invented new and useful Improvements in Gas Furnaces for Photo-Engravers, Et of which the following is a specification.

This invention relates to gas furnaces employed by photo-engravers to burn in certain chemicals applied to metal plates in the process of etching such plates.

A furnace of this character comprises a base having gas-conducting means, a multiple burner receiving gas from said means, and air from the atmosphere, and provided with a multiplicity of burner orifices at which a mixture of gas and air is ignited, and with means for supporting a coated plate above the burner orifices during the burning in operation. The burner orifices are liable tobe clogged by melted material dropping from the plates, so that frequent cleaning is necessary.

The chief object of the invention is to provide an improved construction in furnaces of this description, whereby the convenient removal and cleaning of the multiple burner is permitted.

Another object is to permit the employment of a plurality of multiple burner units, each bearing loosely and separably on and independently removable from the base.

Another object is to provide an improved construction of the base and the plate-supporting means associated therewith.

The above-mentioned and other objects are attained by the improvements hereinafter described and claimed. I

@f the accompanying drawings forming a part of this specification,

Figure 1 is a plan view of a furnace embodying the invention.

Figure 2 is a fragmentary section on line 22 of Figure 1.

Figure 3 is a section on line 3-3 of Figure 1.

Figure 4: is a fragmentary plan view showing a portion of the base.

Figure 5 is a fragmentary plan view, showing a portion of one of the multiple burner units shown by Figure 1.

The same reference characters indicate the same parts in all of the figures.

The base of my improved furnace preferably includes a marginal rectangular frame,

6, 1922. Serial No. 586,455.

each of the members of which is of angular form, and has a wall or curb portion 12, and an inwardly projecting flange 13. One of the frame members is provided with a gas conduit 14, preferably ca t integral with said member and receiving gas through a supply pipe line 15, controlled by a cock 16. Said conduit is provided with a burner nipple 17, having a shoulder 18, said nipple being controlled by a cool: 19.

The base also includes upwardly facing burner seats on which a multiple burner' may be loosely and removably supported, said seats being preferably embodied in a plurality of cross-bars 20, attached by screws 1 to the flanges 13 of two of the frame members.

I prefer to utilize the rest members or cross-bars to support a plurality of seats, adapted to support a'plate or plates 31, at a suitable height above the burner orifices hereinafter described. Said seats are the upper ends of a plurality of studs 22, attached to and projecting upward from the cross-bars 20.

The base maybe formed to support any desired number of multiple burner units, each unit being adapted to bear loosely and removably on the cross-bars 20, and provided with a receiving throat adaptedto re ceive gas from a gas outlet on the base, and having air inlets adapted to receive air from the atmosphere.

Each. burner is provided also with a plurality of burner orifices, these being spaced below the plate seats when the burner is operatively installed onthe base.

The preferred burner construction is as follows: represents a tubular head pr0- vided at one side and between its ends with a flaring or conicalthroat 24, having an end face containing a central orifice 25, adapted to loosely receive the nipple 17, the end face being formed to abut against the shoulder 18, and provided with air inlets 26,'through which air enters the throat to mix with the gas delivered by the nipple 17.

With thehead 23 are connected a plurality of parallel tubes 28, arranged to bear loosely and removably on the cross-bars 20, and each provided with a plurality of burner orifices 29, in its upper side, the outer ends of said tubes being closed by caps 30.

When the burner and the base are separated, as indicated by Figures 4 and 5, the burner may be operatively installed on the memes base by inclining the enable the opening to ceive the nipple 1"? and t tubes 28 on the being thus horizo burner orifices 1 plate 31, cl posi s by the studs 22.

It will be that t at. conveniently removed from the clining it to lift the tubes 2d, cross-bars. and, when it is suite moving it enclwis With-mew from the nipple 17. hen the l on the seats 20, it cenno; l far enough to Withdraw the t. nipple, one of the members 0 constituting a stop limiting enclWise movement of the Venting the Withdrawal of t from the nipple.

Although I have shown. two huiner units as speci- I" uprising 1' which fomns claimed may he emhoclierl in a 'tuii'na-- said. u. l A V 1 the lower ing one burner, or more than two :3 edge I aid burner and that the form and cons lion seat R. :espeotivebase and the burner may he i L i'iously l shits fined fiecl Within the scope of the appended elni to th e L part up- I claim: right i the cross-hers and p113- 1. A gas furnace of the character sti ed, jeoti: above the frame comprising e fixed base strive-tum including In testimony whereof I have afiixetl my an open frame, spaced apart bu e1 new; signature. Within the "frame opening, speoetl apart plat-e seats projecting above the JAMES CROF'E.

lz'anle, and 

